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2. Schrader valve - Wikipedia

   en.wikipedia.org/wiki/Schrader_valve

   A valve cap on a Schrader valve prevents the entry of contaminants that may interfere with the sealing surfaces and cause leakage. Metal, and some hard plastic valve caps, have a rubber washer or O-ring inside, both to prevent the cap from loosening and falling off due to vibration.

3. Dustcap - Wikipedia

   en.wikipedia.org/wiki/Dustcap

   A dustcap is a small cover used on the valve stem of a bicycle or car tire to prevent dust or other small particles from entering the valve and damaging it. Dustcaps are usually made from plastic but may occasionally be made of metal. The dustcap is internally threaded and is secured by screwing it onto the end of the stem.

4. Presta valve - Wikipedia

   en.wikipedia.org/wiki/Presta_valve

   The Presta valve (also French valve (FV) or Sclaverand valve) is a type of tire valve commonly found on high pressure bicycle inner tubes and is commonly used on tubeless setups. It consists of an outer valve stem and an inner valve body. A lock nut to secure the stem at the wheel rim and a valve cap may also be present.

5. Valve stem - Wikipedia

   en.wikipedia.org/wiki/Valve_stem

   An inflator stem is not used; instead, a removable cap on a valve stem embedded in the tire rim is fitted, with only the cap visible. When inflating the tire, the cap is first removed, typically with a coin, and then a "portable" dedicated inflator stem is screwed onto the valve stem. Through the inflator, the tire is inflated as usual.

6. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   Compression connectors on an isolating valve; the reddish part is a copper compression ring Compression fittings (sometimes called "lock-bush fittings") consist of a tapered, concave conical seat; a hollow, barrel-shaped compression ring (sometimes called a ferrule); and a compression nut which is threaded onto the body of the fitting and ...

7. Hagmann valve - Wikipedia

   en.wikipedia.org/wiki/Hagmann_valve

   Hagmann valve, in default (A) and engaged (B) positions, top (above) and side view (below). 1. air flow, from mouthpiece; 2. air flow, to bell; 3. air flow to and from valve tubing; 4. valve casing; 5. valve cap; 6. straight-path valve port; 7. valve ports, to tubing emerging at the top of the valve casing; 8. spindle axis of rotation.